kern_sysctl.c revision 247656
11541Srgrimes/*- 21541Srgrimes * Copyright (c) 1982, 1986, 1989, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * This code is derived from software contributed to Berkeley by 61541Srgrimes * Mike Karels at Berkeley Software Design, Inc. 71541Srgrimes * 812623Sphk * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD 912623Sphk * project, to make these variables more userfriendly. 1012623Sphk * 111541Srgrimes * Redistribution and use in source and binary forms, with or without 121541Srgrimes * modification, are permitted provided that the following conditions 131541Srgrimes * are met: 141541Srgrimes * 1. Redistributions of source code must retain the above copyright 151541Srgrimes * notice, this list of conditions and the following disclaimer. 161541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 171541Srgrimes * notice, this list of conditions and the following disclaimer in the 181541Srgrimes * documentation and/or other materials provided with the distribution. 191541Srgrimes * 4. Neither the name of the University nor the names of its contributors 201541Srgrimes * may be used to endorse or promote products derived from this software 211541Srgrimes * without specific prior written permission. 221541Srgrimes * 231541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 241541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 251541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 261541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 271541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 281541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 291541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 301541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 311541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 321541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 331541Srgrimes * SUCH DAMAGE. 341541Srgrimes * 351541Srgrimes * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 361541Srgrimes */ 371541Srgrimes 38116182Sobrien#include <sys/cdefs.h> 39116182Sobrien__FBSDID("$FreeBSD: stable/9/sys/kern/kern_sysctl.c 247656 2013-03-02 17:39:11Z marius $"); 40116182Sobrien 41224159Srwatson#include "opt_capsicum.h" 4231778Seivind#include "opt_compat.h" 43189707Sjhb#include "opt_ktrace.h" 4431778Seivind 451541Srgrimes#include <sys/param.h> 46216060Smdf#include <sys/fail.h> 4748274Speter#include <sys/systm.h> 48224159Srwatson#include <sys/capability.h> 4948274Speter#include <sys/kernel.h> 501541Srgrimes#include <sys/sysctl.h> 5112623Sphk#include <sys/malloc.h> 52164033Srwatson#include <sys/priv.h> 5312662Sdg#include <sys/proc.h> 54194368Sbz#include <sys/jail.h> 5582746Sdillon#include <sys/lock.h> 5682746Sdillon#include <sys/mutex.h> 57212750Smdf#include <sys/sbuf.h> 5893616Salfred#include <sys/sx.h> 5915103Sphk#include <sys/sysproto.h> 60185983Skib#include <sys/uio.h> 61189707Sjhb#ifdef KTRACE 62189707Sjhb#include <sys/ktrace.h> 63189707Sjhb#endif 64163606Srwatson 65195699Srwatson#include <net/vnet.h> 66195699Srwatson 67163606Srwatson#include <security/mac/mac_framework.h> 68163606Srwatson 6912645Sbde#include <vm/vm.h> 7012662Sdg#include <vm/vm_extern.h> 7112645Sbde 7230354Sphkstatic MALLOC_DEFINE(M_SYSCTL, "sysctl", "sysctl internal magic"); 7363212Sabialstatic MALLOC_DEFINE(M_SYSCTLOID, "sysctloid", "sysctl dynamic oids"); 74100833Struckmanstatic MALLOC_DEFINE(M_SYSCTLTMP, "sysctltmp", "sysctl temp output buffer"); 7530309Sphk 7612429Sphk/* 77188232Sjhb * The sysctllock protects the MIB tree. It also protects sysctl 78188232Sjhb * contexts used with dynamic sysctls. The sysctl_register_oid() and 79188232Sjhb * sysctl_unregister_oid() routines require the sysctllock to already 80188232Sjhb * be held, so the sysctl_lock() and sysctl_unlock() routines are 81188232Sjhb * provided for the few places in the kernel which need to use that 82188232Sjhb * API rather than using the dynamic API. Use of the dynamic API is 83188232Sjhb * strongly encouraged for most code. 84188232Sjhb * 85192125Sjhb * The sysctlmemlock is used to limit the amount of user memory wired for 86192125Sjhb * sysctl requests. This is implemented by serializing any userland 87192125Sjhb * sysctl requests larger than a single page via an exclusive lock. 8812429Sphk */ 8993625Srwatsonstatic struct sx sysctllock; 90192125Sjhbstatic struct sx sysctlmemlock; 9112429Sphk 92188232Sjhb#define SYSCTL_XLOCK() sx_xlock(&sysctllock) 93188232Sjhb#define SYSCTL_XUNLOCK() sx_xunlock(&sysctllock) 94188232Sjhb#define SYSCTL_ASSERT_XLOCKED() sx_assert(&sysctllock, SA_XLOCKED) 95112107Sjhb#define SYSCTL_INIT() sx_init(&sysctllock, "sysctl lock") 96216060Smdf#define SYSCTL_SLEEP(ch, wmesg, timo) \ 97216060Smdf sx_sleep(ch, &sysctllock, 0, wmesg, timo) 9893616Salfred 9962573Sphkstatic int sysctl_root(SYSCTL_HANDLER_ARGS); 10012429Sphk 10144078Sdfrstruct sysctl_oid_list sysctl__children; /* root list */ 10212152Sphk 103188232Sjhbstatic int sysctl_remove_oid_locked(struct sysctl_oid *oidp, int del, 104188232Sjhb int recurse); 105188232Sjhb 10663212Sabialstatic struct sysctl_oid * 10763212Sabialsysctl_find_oidname(const char *name, struct sysctl_oid_list *list) 10863212Sabial{ 10963212Sabial struct sysctl_oid *oidp; 11063212Sabial 111216060Smdf SYSCTL_ASSERT_XLOCKED(); 11263212Sabial SLIST_FOREACH(oidp, list, oid_link) { 11363212Sabial if (strcmp(oidp->oid_name, name) == 0) { 11463212Sabial return (oidp); 11563212Sabial } 11663212Sabial } 11763212Sabial return (NULL); 11863212Sabial} 11963212Sabial 12012623Sphk/* 12112623Sphk * Initialization of the MIB tree. 12212623Sphk * 12344078Sdfr * Order by number in each list. 12412623Sphk */ 125188232Sjhbvoid 126188232Sjhbsysctl_lock(void) 127188232Sjhb{ 12812429Sphk 129188232Sjhb SYSCTL_XLOCK(); 130188232Sjhb} 131188232Sjhb 13280338Sroamvoid 133188232Sjhbsysctl_unlock(void) 134188232Sjhb{ 135188232Sjhb 136188232Sjhb SYSCTL_XUNLOCK(); 137188232Sjhb} 138188232Sjhb 139188232Sjhbvoid 14080338Sroamsysctl_register_oid(struct sysctl_oid *oidp) 14112152Sphk{ 14244078Sdfr struct sysctl_oid_list *parent = oidp->oid_parent; 14344078Sdfr struct sysctl_oid *p; 14444078Sdfr struct sysctl_oid *q; 14512197Sbde 14644078Sdfr /* 14763212Sabial * First check if another oid with the same name already 14863212Sabial * exists in the parent's list. 14963212Sabial */ 150188232Sjhb SYSCTL_ASSERT_XLOCKED(); 15163212Sabial p = sysctl_find_oidname(oidp->oid_name, parent); 15263212Sabial if (p != NULL) { 15363212Sabial if ((p->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 15463212Sabial p->oid_refcnt++; 15563212Sabial return; 15663212Sabial } else { 15763212Sabial printf("can't re-use a leaf (%s)!\n", p->oid_name); 15863212Sabial return; 15963212Sabial } 16063212Sabial } 16163212Sabial /* 16244078Sdfr * If this oid has a number OID_AUTO, give it a number which 16380339Sroam * is greater than any current oid. 16480339Sroam * NOTE: DO NOT change the starting value here, change it in 16580339Sroam * <sys/sysctl.h>, and make sure it is at least 256 to 16680339Sroam * accomodate e.g. net.inet.raw as a static sysctl node. 16744078Sdfr */ 16844078Sdfr if (oidp->oid_number == OID_AUTO) { 16980339Sroam static int newoid = CTL_AUTO_START; 17071510Smckusick 17171510Smckusick oidp->oid_number = newoid++; 17271510Smckusick if (newoid == 0x7fffffff) 17371510Smckusick panic("out of oids"); 17444078Sdfr } 17584832Sroam#if 0 17684832Sroam else if (oidp->oid_number >= CTL_AUTO_START) { 17784832Sroam /* do not panic; this happens when unregistering sysctl sets */ 17884832Sroam printf("static sysctl oid too high: %d", oidp->oid_number); 17984832Sroam } 18084832Sroam#endif 18144078Sdfr 18244078Sdfr /* 18344078Sdfr * Insert the oid into the parent's list in order. 18444078Sdfr */ 18544078Sdfr q = NULL; 18644078Sdfr SLIST_FOREACH(p, parent, oid_link) { 18744078Sdfr if (oidp->oid_number < p->oid_number) 18844078Sdfr break; 18944078Sdfr q = p; 19044078Sdfr } 19144078Sdfr if (q) 19244078Sdfr SLIST_INSERT_AFTER(q, oidp, oid_link); 19344078Sdfr else 19444078Sdfr SLIST_INSERT_HEAD(parent, oidp, oid_link); 19512152Sphk} 19612131Sphk 19780338Sroamvoid 19880338Sroamsysctl_unregister_oid(struct sysctl_oid *oidp) 19912152Sphk{ 200115391Smux struct sysctl_oid *p; 201115391Smux int error; 202115391Smux 203188232Sjhb SYSCTL_ASSERT_XLOCKED(); 204115391Smux error = ENOENT; 205115391Smux if (oidp->oid_number == OID_AUTO) { 206115391Smux error = EINVAL; 207115391Smux } else { 208115391Smux SLIST_FOREACH(p, oidp->oid_parent, oid_link) { 209115391Smux if (p == oidp) { 210115391Smux SLIST_REMOVE(oidp->oid_parent, oidp, 211115391Smux sysctl_oid, oid_link); 212115391Smux error = 0; 213115391Smux break; 214115391Smux } 215115391Smux } 216115391Smux } 217115391Smux 218115391Smux /* 219115391Smux * This can happen when a module fails to register and is 220115391Smux * being unloaded afterwards. It should not be a panic() 221115391Smux * for normal use. 222115391Smux */ 223115391Smux if (error) 224115391Smux printf("%s: failed to unregister sysctl\n", __func__); 22544078Sdfr} 22612152Sphk 22763212Sabial/* Initialize a new context to keep track of dynamically added sysctls. */ 22863212Sabialint 22963212Sabialsysctl_ctx_init(struct sysctl_ctx_list *c) 23063212Sabial{ 23163212Sabial 23263212Sabial if (c == NULL) { 23363212Sabial return (EINVAL); 23463212Sabial } 235188232Sjhb 236188232Sjhb /* 237188232Sjhb * No locking here, the caller is responsible for not adding 238188232Sjhb * new nodes to a context until after this function has 239188232Sjhb * returned. 240188232Sjhb */ 24163212Sabial TAILQ_INIT(c); 24263212Sabial return (0); 24363212Sabial} 24463212Sabial 24563212Sabial/* Free the context, and destroy all dynamic oids registered in this context */ 24663212Sabialint 24763212Sabialsysctl_ctx_free(struct sysctl_ctx_list *clist) 24863212Sabial{ 24963212Sabial struct sysctl_ctx_entry *e, *e1; 25063212Sabial int error; 25163212Sabial 25263212Sabial error = 0; 25363212Sabial /* 25463212Sabial * First perform a "dry run" to check if it's ok to remove oids. 25563212Sabial * XXX FIXME 25663212Sabial * XXX This algorithm is a hack. But I don't know any 25763212Sabial * XXX better solution for now... 25863212Sabial */ 259188232Sjhb SYSCTL_XLOCK(); 26063212Sabial TAILQ_FOREACH(e, clist, link) { 261188232Sjhb error = sysctl_remove_oid_locked(e->entry, 0, 0); 26263212Sabial if (error) 26363212Sabial break; 26463212Sabial } 26563212Sabial /* 26663212Sabial * Restore deregistered entries, either from the end, 26763212Sabial * or from the place where error occured. 26863212Sabial * e contains the entry that was not unregistered 26963212Sabial */ 27063212Sabial if (error) 27163212Sabial e1 = TAILQ_PREV(e, sysctl_ctx_list, link); 27263212Sabial else 27363212Sabial e1 = TAILQ_LAST(clist, sysctl_ctx_list); 27463212Sabial while (e1 != NULL) { 27563212Sabial sysctl_register_oid(e1->entry); 27663212Sabial e1 = TAILQ_PREV(e1, sysctl_ctx_list, link); 27763212Sabial } 278188232Sjhb if (error) { 279188232Sjhb SYSCTL_XUNLOCK(); 28063212Sabial return(EBUSY); 281188232Sjhb } 28263212Sabial /* Now really delete the entries */ 28363212Sabial e = TAILQ_FIRST(clist); 28463212Sabial while (e != NULL) { 28563212Sabial e1 = TAILQ_NEXT(e, link); 286188232Sjhb error = sysctl_remove_oid_locked(e->entry, 1, 0); 28763212Sabial if (error) 28863212Sabial panic("sysctl_remove_oid: corrupt tree, entry: %s", 28963212Sabial e->entry->oid_name); 29063212Sabial free(e, M_SYSCTLOID); 29163212Sabial e = e1; 29263212Sabial } 293188232Sjhb SYSCTL_XUNLOCK(); 29463212Sabial return (error); 29563212Sabial} 29663212Sabial 29763212Sabial/* Add an entry to the context */ 29863212Sabialstruct sysctl_ctx_entry * 29963212Sabialsysctl_ctx_entry_add(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 30063212Sabial{ 30163212Sabial struct sysctl_ctx_entry *e; 30263212Sabial 303188232Sjhb SYSCTL_ASSERT_XLOCKED(); 30463212Sabial if (clist == NULL || oidp == NULL) 30563212Sabial return(NULL); 306111119Simp e = malloc(sizeof(struct sysctl_ctx_entry), M_SYSCTLOID, M_WAITOK); 30763212Sabial e->entry = oidp; 30863212Sabial TAILQ_INSERT_HEAD(clist, e, link); 30963212Sabial return (e); 31063212Sabial} 31163212Sabial 31263212Sabial/* Find an entry in the context */ 31363212Sabialstruct sysctl_ctx_entry * 31463212Sabialsysctl_ctx_entry_find(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 31563212Sabial{ 31663212Sabial struct sysctl_ctx_entry *e; 31763212Sabial 318216060Smdf SYSCTL_ASSERT_XLOCKED(); 31963212Sabial if (clist == NULL || oidp == NULL) 32063212Sabial return(NULL); 32171999Sphk TAILQ_FOREACH(e, clist, link) { 32263212Sabial if(e->entry == oidp) 32363212Sabial return(e); 32463212Sabial } 32563212Sabial return (e); 32663212Sabial} 32763212Sabial 32844078Sdfr/* 32963212Sabial * Delete an entry from the context. 33063212Sabial * NOTE: this function doesn't free oidp! You have to remove it 33163212Sabial * with sysctl_remove_oid(). 33263212Sabial */ 33363212Sabialint 33463212Sabialsysctl_ctx_entry_del(struct sysctl_ctx_list *clist, struct sysctl_oid *oidp) 33563212Sabial{ 33663212Sabial struct sysctl_ctx_entry *e; 33763212Sabial 33863212Sabial if (clist == NULL || oidp == NULL) 33963212Sabial return (EINVAL); 340188232Sjhb SYSCTL_XLOCK(); 34163212Sabial e = sysctl_ctx_entry_find(clist, oidp); 34263212Sabial if (e != NULL) { 34363212Sabial TAILQ_REMOVE(clist, e, link); 344188232Sjhb SYSCTL_XUNLOCK(); 34563212Sabial free(e, M_SYSCTLOID); 34663212Sabial return (0); 347188232Sjhb } else { 348188232Sjhb SYSCTL_XUNLOCK(); 34963212Sabial return (ENOENT); 350188232Sjhb } 35163212Sabial} 35263212Sabial 35363212Sabial/* 35463212Sabial * Remove dynamically created sysctl trees. 35563212Sabial * oidp - top of the tree to be removed 35663212Sabial * del - if 0 - just deregister, otherwise free up entries as well 35763212Sabial * recurse - if != 0 traverse the subtree to be deleted 35863212Sabial */ 35963212Sabialint 36063212Sabialsysctl_remove_oid(struct sysctl_oid *oidp, int del, int recurse) 36163212Sabial{ 362188232Sjhb int error; 363188232Sjhb 364188232Sjhb SYSCTL_XLOCK(); 365188232Sjhb error = sysctl_remove_oid_locked(oidp, del, recurse); 366188232Sjhb SYSCTL_XUNLOCK(); 367188232Sjhb return (error); 368188232Sjhb} 369188232Sjhb 370219819Sjeffint 371219819Sjeffsysctl_remove_name(struct sysctl_oid *parent, const char *name, 372219819Sjeff int del, int recurse) 373219819Sjeff{ 374219819Sjeff struct sysctl_oid *p, *tmp; 375219819Sjeff int error; 376219819Sjeff 377219819Sjeff error = ENOENT; 378219819Sjeff SYSCTL_XLOCK(); 379219819Sjeff SLIST_FOREACH_SAFE(p, SYSCTL_CHILDREN(parent), oid_link, tmp) { 380219819Sjeff if (strcmp(p->oid_name, name) == 0) { 381219819Sjeff error = sysctl_remove_oid_locked(p, del, recurse); 382219819Sjeff break; 383219819Sjeff } 384219819Sjeff } 385219819Sjeff SYSCTL_XUNLOCK(); 386219819Sjeff 387219819Sjeff return (error); 388219819Sjeff} 389219819Sjeff 390219819Sjeff 391188232Sjhbstatic int 392188232Sjhbsysctl_remove_oid_locked(struct sysctl_oid *oidp, int del, int recurse) 393188232Sjhb{ 394219819Sjeff struct sysctl_oid *p, *tmp; 39563212Sabial int error; 39663212Sabial 397188232Sjhb SYSCTL_ASSERT_XLOCKED(); 39863212Sabial if (oidp == NULL) 39963212Sabial return(EINVAL); 40063212Sabial if ((oidp->oid_kind & CTLFLAG_DYN) == 0) { 40163212Sabial printf("can't remove non-dynamic nodes!\n"); 40263212Sabial return (EINVAL); 40363212Sabial } 40463212Sabial /* 40563212Sabial * WARNING: normal method to do this should be through 40663212Sabial * sysctl_ctx_free(). Use recursing as the last resort 40763212Sabial * method to purge your sysctl tree of leftovers... 40863212Sabial * However, if some other code still references these nodes, 40963212Sabial * it will panic. 41063212Sabial */ 41163212Sabial if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 41263212Sabial if (oidp->oid_refcnt == 1) { 413219819Sjeff SLIST_FOREACH_SAFE(p, 414219819Sjeff SYSCTL_CHILDREN(oidp), oid_link, tmp) { 41563212Sabial if (!recurse) 41663212Sabial return (ENOTEMPTY); 417188232Sjhb error = sysctl_remove_oid_locked(p, del, 418188232Sjhb recurse); 41963212Sabial if (error) 42063212Sabial return (error); 42163212Sabial } 42263212Sabial if (del) 42363212Sabial free(SYSCTL_CHILDREN(oidp), M_SYSCTLOID); 42463212Sabial } 42563212Sabial } 42663212Sabial if (oidp->oid_refcnt > 1 ) { 42763212Sabial oidp->oid_refcnt--; 42863212Sabial } else { 42963212Sabial if (oidp->oid_refcnt == 0) { 43063212Sabial printf("Warning: bad oid_refcnt=%u (%s)!\n", 43163212Sabial oidp->oid_refcnt, oidp->oid_name); 43263212Sabial return (EINVAL); 43363212Sabial } 43463212Sabial sysctl_unregister_oid(oidp); 43563212Sabial if (del) { 436216060Smdf /* 437216060Smdf * Wait for all threads running the handler to drain. 438216060Smdf * This preserves the previous behavior when the 439216060Smdf * sysctl lock was held across a handler invocation, 440216060Smdf * and is necessary for module unload correctness. 441216060Smdf */ 442216060Smdf while (oidp->oid_running > 0) { 443216060Smdf oidp->oid_kind |= CTLFLAG_DYING; 444216060Smdf SYSCTL_SLEEP(&oidp->oid_running, "oidrm", 0); 445216060Smdf } 446141433Sphk if (oidp->oid_descr) 447141433Sphk free((void *)(uintptr_t)(const void *)oidp->oid_descr, M_SYSCTLOID); 44863978Speter free((void *)(uintptr_t)(const void *)oidp->oid_name, 44963978Speter M_SYSCTLOID); 45063212Sabial free(oidp, M_SYSCTLOID); 45163212Sabial } 45263212Sabial } 45363212Sabial return (0); 45463212Sabial} 45563212Sabial/* 45663212Sabial * Create new sysctls at run time. 45763212Sabial * clist may point to a valid context initialized with sysctl_ctx_init(). 45863212Sabial */ 45963212Sabialstruct sysctl_oid * 46063212Sabialsysctl_add_oid(struct sysctl_ctx_list *clist, struct sysctl_oid_list *parent, 461219819Sjeff int number, const char *name, int kind, void *arg1, intptr_t arg2, 46270679Sjhb int (*handler)(SYSCTL_HANDLER_ARGS), const char *fmt, const char *descr) 46363212Sabial{ 46463212Sabial struct sysctl_oid *oidp; 46563212Sabial ssize_t len; 46663978Speter char *newname; 46763212Sabial 46863212Sabial /* You have to hook up somewhere.. */ 46963212Sabial if (parent == NULL) 47063212Sabial return(NULL); 47163212Sabial /* Check if the node already exists, otherwise create it */ 472188232Sjhb SYSCTL_XLOCK(); 47363212Sabial oidp = sysctl_find_oidname(name, parent); 47463212Sabial if (oidp != NULL) { 47563212Sabial if ((oidp->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 47663212Sabial oidp->oid_refcnt++; 47763212Sabial /* Update the context */ 47863212Sabial if (clist != NULL) 47963212Sabial sysctl_ctx_entry_add(clist, oidp); 480188232Sjhb SYSCTL_XUNLOCK(); 48163212Sabial return (oidp); 48263212Sabial } else { 483188232Sjhb SYSCTL_XUNLOCK(); 48463212Sabial printf("can't re-use a leaf (%s)!\n", name); 48563212Sabial return (NULL); 48663212Sabial } 48763212Sabial } 488111119Simp oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK|M_ZERO); 48963212Sabial oidp->oid_parent = parent; 49063212Sabial SLIST_NEXT(oidp, oid_link) = NULL; 49163212Sabial oidp->oid_number = number; 49263212Sabial oidp->oid_refcnt = 1; 49363212Sabial len = strlen(name); 494111119Simp newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK); 49563978Speter bcopy(name, newname, len + 1); 49663978Speter newname[len] = '\0'; 49763978Speter oidp->oid_name = newname; 49863212Sabial oidp->oid_handler = handler; 49963212Sabial oidp->oid_kind = CTLFLAG_DYN | kind; 50063212Sabial if ((kind & CTLTYPE) == CTLTYPE_NODE) { 50163212Sabial /* Allocate space for children */ 502132776Skan SYSCTL_CHILDREN_SET(oidp, malloc(sizeof(struct sysctl_oid_list), 503132776Skan M_SYSCTLOID, M_WAITOK)); 50463212Sabial SLIST_INIT(SYSCTL_CHILDREN(oidp)); 505219819Sjeff oidp->oid_arg2 = arg2; 50663212Sabial } else { 50763212Sabial oidp->oid_arg1 = arg1; 50863212Sabial oidp->oid_arg2 = arg2; 50963212Sabial } 51063212Sabial oidp->oid_fmt = fmt; 51188006Sluigi if (descr) { 51288006Sluigi int len = strlen(descr) + 1; 513141433Sphk oidp->oid_descr = malloc(len, M_SYSCTLOID, M_WAITOK); 514141433Sphk if (oidp->oid_descr) 515141433Sphk strcpy((char *)(uintptr_t)(const void *)oidp->oid_descr, descr); 51688006Sluigi } 51763212Sabial /* Update the context, if used */ 51863212Sabial if (clist != NULL) 51963212Sabial sysctl_ctx_entry_add(clist, oidp); 52063212Sabial /* Register this oid */ 52163212Sabial sysctl_register_oid(oidp); 522188232Sjhb SYSCTL_XUNLOCK(); 52363212Sabial return (oidp); 52463212Sabial} 52563212Sabial 52663212Sabial/* 527174113Speter * Rename an existing oid. 528174113Speter */ 529174113Spetervoid 530174113Spetersysctl_rename_oid(struct sysctl_oid *oidp, const char *name) 531174113Speter{ 532174113Speter ssize_t len; 533174113Speter char *newname; 534174113Speter void *oldname; 535174113Speter 536174113Speter len = strlen(name); 537174113Speter newname = malloc(len + 1, M_SYSCTLOID, M_WAITOK); 538174113Speter bcopy(name, newname, len + 1); 539174113Speter newname[len] = '\0'; 540188232Sjhb SYSCTL_XLOCK(); 541188232Sjhb oldname = (void *)(uintptr_t)(const void *)oidp->oid_name; 542174113Speter oidp->oid_name = newname; 543188232Sjhb SYSCTL_XUNLOCK(); 544174113Speter free(oldname, M_SYSCTLOID); 545174113Speter} 546174113Speter 547174113Speter/* 548126319Sdes * Reparent an existing oid. 549126319Sdes */ 550126319Sdesint 551126319Sdessysctl_move_oid(struct sysctl_oid *oid, struct sysctl_oid_list *parent) 552126319Sdes{ 553126319Sdes struct sysctl_oid *oidp; 554126319Sdes 555188232Sjhb SYSCTL_XLOCK(); 556188232Sjhb if (oid->oid_parent == parent) { 557188232Sjhb SYSCTL_XUNLOCK(); 558126319Sdes return (0); 559188232Sjhb } 560126319Sdes oidp = sysctl_find_oidname(oid->oid_name, parent); 561188232Sjhb if (oidp != NULL) { 562188232Sjhb SYSCTL_XUNLOCK(); 563126319Sdes return (EEXIST); 564188232Sjhb } 565126319Sdes sysctl_unregister_oid(oid); 566126319Sdes oid->oid_parent = parent; 567126319Sdes oid->oid_number = OID_AUTO; 568126319Sdes sysctl_register_oid(oid); 569188232Sjhb SYSCTL_XUNLOCK(); 570126319Sdes return (0); 571126319Sdes} 572126319Sdes 573126319Sdes/* 57444078Sdfr * Register the kernel's oids on startup. 57544078Sdfr */ 57678161SpeterSET_DECLARE(sysctl_set, struct sysctl_oid); 57712152Sphk 57880338Sroamstatic void 57980338Sroamsysctl_register_all(void *arg) 58038869Sbde{ 58178161Speter struct sysctl_oid **oidp; 58278161Speter 583192125Sjhb sx_init(&sysctlmemlock, "sysctl mem"); 58493625Srwatson SYSCTL_INIT(); 585188232Sjhb SYSCTL_XLOCK(); 58678161Speter SET_FOREACH(oidp, sysctl_set) 58778161Speter sysctl_register_oid(*oidp); 588188232Sjhb SYSCTL_XUNLOCK(); 58938869Sbde} 59044078SdfrSYSINIT(sysctl, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_all, 0); 59144078Sdfr 59212623Sphk/* 59312623Sphk * "Staff-functions" 59412623Sphk * 59512650Sphk * These functions implement a presently undocumented interface 59612650Sphk * used by the sysctl program to walk the tree, and get the type 59712650Sphk * so it can print the value. 59812650Sphk * This interface is under work and consideration, and should probably 59912650Sphk * be killed with a big axe by the first person who can find the time. 60012650Sphk * (be aware though, that the proper interface isn't as obvious as it 60112650Sphk * may seem, there are various conflicting requirements. 60212650Sphk * 60312623Sphk * {0,0} printf the entire MIB-tree. 60412623Sphk * {0,1,...} return the name of the "..." OID. 60542467Sphk * {0,2,...} return the next OID. 60612623Sphk * {0,3} return the OID of the name in "new" 60712650Sphk * {0,4,...} return the kind & format info for the "..." OID. 60888006Sluigi * {0,5,...} return the description the "..." OID. 60912623Sphk */ 61012623Sphk 611136999Srwatson#ifdef SYSCTL_DEBUG 61212152Sphkstatic void 61344078Sdfrsysctl_sysctl_debug_dump_node(struct sysctl_oid_list *l, int i) 61412152Sphk{ 61544078Sdfr int k; 61644078Sdfr struct sysctl_oid *oidp; 61712152Sphk 618216060Smdf SYSCTL_ASSERT_XLOCKED(); 61944078Sdfr SLIST_FOREACH(oidp, l, oid_link) { 62012152Sphk 62112152Sphk for (k=0; k<i; k++) 62212152Sphk printf(" "); 62312152Sphk 62444078Sdfr printf("%d %s ", oidp->oid_number, oidp->oid_name); 62512152Sphk 62612152Sphk printf("%c%c", 62744078Sdfr oidp->oid_kind & CTLFLAG_RD ? 'R':' ', 62844078Sdfr oidp->oid_kind & CTLFLAG_WR ? 'W':' '); 62912152Sphk 63044078Sdfr if (oidp->oid_handler) 63115241Sphk printf(" *Handler"); 63215241Sphk 63344078Sdfr switch (oidp->oid_kind & CTLTYPE) { 63412243Sphk case CTLTYPE_NODE: 63515241Sphk printf(" Node\n"); 63644078Sdfr if (!oidp->oid_handler) { 63712152Sphk sysctl_sysctl_debug_dump_node( 63844078Sdfr oidp->oid_arg1, i+2); 63912152Sphk } 64012152Sphk break; 64112152Sphk case CTLTYPE_INT: printf(" Int\n"); break; 642217616Smdf case CTLTYPE_UINT: printf(" u_int\n"); break; 643217616Smdf case CTLTYPE_LONG: printf(" Long\n"); break; 644217616Smdf case CTLTYPE_ULONG: printf(" u_long\n"); break; 64512152Sphk case CTLTYPE_STRING: printf(" String\n"); break; 646217616Smdf case CTLTYPE_U64: printf(" uint64_t\n"); break; 647217616Smdf case CTLTYPE_S64: printf(" int64_t\n"); break; 64812152Sphk case CTLTYPE_OPAQUE: printf(" Opaque/struct\n"); break; 64912152Sphk default: printf("\n"); 65012152Sphk } 65112152Sphk 65212152Sphk } 65312152Sphk} 65412152Sphk 65512152Sphkstatic int 65662573Sphksysctl_sysctl_debug(SYSCTL_HANDLER_ARGS) 65712152Sphk{ 65887024Speter int error; 65987024Speter 660164033Srwatson error = priv_check(req->td, PRIV_SYSCTL_DEBUG); 66187024Speter if (error) 662139483Spjd return (error); 663216060Smdf SYSCTL_XLOCK(); 66444078Sdfr sysctl_sysctl_debug_dump_node(&sysctl__children, 0); 665216060Smdf SYSCTL_XUNLOCK(); 666139483Spjd return (ENOENT); 66712152Sphk} 66812152Sphk 66912152SphkSYSCTL_PROC(_sysctl, 0, debug, CTLTYPE_STRING|CTLFLAG_RD, 67012623Sphk 0, 0, sysctl_sysctl_debug, "-", ""); 671136999Srwatson#endif 67212152Sphk 67312623Sphkstatic int 67462573Sphksysctl_sysctl_name(SYSCTL_HANDLER_ARGS) 67512623Sphk{ 67612623Sphk int *name = (int *) arg1; 67712623Sphk u_int namelen = arg2; 67844078Sdfr int error = 0; 67944078Sdfr struct sysctl_oid *oid; 68044972Sphk struct sysctl_oid_list *lsp = &sysctl__children, *lsp2; 68112623Sphk char buf[10]; 68212131Sphk 683216060Smdf SYSCTL_XLOCK(); 68412623Sphk while (namelen) { 68512623Sphk if (!lsp) { 68641514Sarchie snprintf(buf,sizeof(buf),"%d",*name); 68712623Sphk if (req->oldidx) 68812623Sphk error = SYSCTL_OUT(req, ".", 1); 68912623Sphk if (!error) 69012623Sphk error = SYSCTL_OUT(req, buf, strlen(buf)); 69112623Sphk if (error) 692216060Smdf goto out; 69312623Sphk namelen--; 69412623Sphk name++; 69512623Sphk continue; 69612623Sphk } 69744972Sphk lsp2 = 0; 69844078Sdfr SLIST_FOREACH(oid, lsp, oid_link) { 69944078Sdfr if (oid->oid_number != *name) 70012623Sphk continue; 70112131Sphk 70212623Sphk if (req->oldidx) 70312623Sphk error = SYSCTL_OUT(req, ".", 1); 70412623Sphk if (!error) 70544078Sdfr error = SYSCTL_OUT(req, oid->oid_name, 70644078Sdfr strlen(oid->oid_name)); 70712623Sphk if (error) 708216060Smdf goto out; 70912623Sphk 71012623Sphk namelen--; 71112623Sphk name++; 71212623Sphk 71344972Sphk if ((oid->oid_kind & CTLTYPE) != CTLTYPE_NODE) 71412623Sphk break; 71512623Sphk 71644078Sdfr if (oid->oid_handler) 71712623Sphk break; 71812623Sphk 719216058Smdf lsp2 = SYSCTL_CHILDREN(oid); 72012623Sphk break; 72112623Sphk } 72244972Sphk lsp = lsp2; 72312623Sphk } 724216060Smdf error = SYSCTL_OUT(req, "", 1); 725216060Smdf out: 726216060Smdf SYSCTL_XUNLOCK(); 727216060Smdf return (error); 72812623Sphk} 72912623Sphk 730224159Srwatson/* 731224159Srwatson * XXXRW/JA: Shouldn't return name data for nodes that we don't permit in 732224159Srwatson * capability mode. 733224159Srwatson */ 734224159Srwatsonstatic SYSCTL_NODE(_sysctl, 1, name, CTLFLAG_RD | CTLFLAG_CAPRD, 735224159Srwatson sysctl_sysctl_name, ""); 73612623Sphk 73712623Sphkstatic int 73863978Spetersysctl_sysctl_next_ls(struct sysctl_oid_list *lsp, int *name, u_int namelen, 73944078Sdfr int *next, int *len, int level, struct sysctl_oid **oidpp) 74012623Sphk{ 74144078Sdfr struct sysctl_oid *oidp; 74212623Sphk 743216060Smdf SYSCTL_ASSERT_XLOCKED(); 74412623Sphk *len = level; 74544078Sdfr SLIST_FOREACH(oidp, lsp, oid_link) { 74644078Sdfr *next = oidp->oid_number; 74744078Sdfr *oidpp = oidp; 74812623Sphk 749101650Smux if (oidp->oid_kind & CTLFLAG_SKIP) 750101650Smux continue; 751101650Smux 75212623Sphk if (!namelen) { 75344078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 754139483Spjd return (0); 75544078Sdfr if (oidp->oid_handler) 75612623Sphk /* We really should call the handler here...*/ 757139483Spjd return (0); 758216058Smdf lsp = SYSCTL_CHILDREN(oidp); 75963978Speter if (!sysctl_sysctl_next_ls(lsp, 0, 0, next+1, 76044078Sdfr len, level+1, oidpp)) 761139483Spjd return (0); 762111260Srwatson goto emptynode; 76312623Sphk } 76412623Sphk 76544078Sdfr if (oidp->oid_number < *name) 76612623Sphk continue; 76712623Sphk 76844078Sdfr if (oidp->oid_number > *name) { 76944078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 770139483Spjd return (0); 77144078Sdfr if (oidp->oid_handler) 772139483Spjd return (0); 773216058Smdf lsp = SYSCTL_CHILDREN(oidp); 77463978Speter if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, 77544078Sdfr next+1, len, level+1, oidpp)) 77612623Sphk return (0); 77715241Sphk goto next; 77812623Sphk } 77944078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 78012623Sphk continue; 78112623Sphk 78244078Sdfr if (oidp->oid_handler) 78312623Sphk continue; 78412623Sphk 785216058Smdf lsp = SYSCTL_CHILDREN(oidp); 78663978Speter if (!sysctl_sysctl_next_ls(lsp, name+1, namelen-1, next+1, 78744078Sdfr len, level+1, oidpp)) 78812623Sphk return (0); 78915241Sphk next: 79012623Sphk namelen = 1; 791111260Srwatson emptynode: 79212623Sphk *len = level; 79312623Sphk } 794139483Spjd return (1); 79512623Sphk} 79612623Sphk 79712623Sphkstatic int 79862573Sphksysctl_sysctl_next(SYSCTL_HANDLER_ARGS) 79912623Sphk{ 80012623Sphk int *name = (int *) arg1; 80112623Sphk u_int namelen = arg2; 80212623Sphk int i, j, error; 80312623Sphk struct sysctl_oid *oid; 80444078Sdfr struct sysctl_oid_list *lsp = &sysctl__children; 80512623Sphk int newoid[CTL_MAXNAME]; 80612623Sphk 807216060Smdf SYSCTL_XLOCK(); 80863978Speter i = sysctl_sysctl_next_ls(lsp, name, namelen, newoid, &j, 1, &oid); 809216060Smdf SYSCTL_XUNLOCK(); 81012623Sphk if (i) 811139483Spjd return (ENOENT); 81212650Sphk error = SYSCTL_OUT(req, newoid, j * sizeof (int)); 81312623Sphk return (error); 81412623Sphk} 81512623Sphk 816224159Srwatson/* 817224159Srwatson * XXXRW/JA: Shouldn't return next data for nodes that we don't permit in 818224159Srwatson * capability mode. 819224159Srwatson */ 820224159Srwatsonstatic SYSCTL_NODE(_sysctl, 2, next, CTLFLAG_RD | CTLFLAG_CAPRD, 821224159Srwatson sysctl_sysctl_next, ""); 82212623Sphk 82312623Sphkstatic int 824189707Sjhbname2oid(char *name, int *oid, int *len, struct sysctl_oid **oidpp) 82512623Sphk{ 82644078Sdfr int i; 82744078Sdfr struct sysctl_oid *oidp; 82844078Sdfr struct sysctl_oid_list *lsp = &sysctl__children; 82912623Sphk char *p; 83012623Sphk 831216060Smdf SYSCTL_ASSERT_XLOCKED(); 832186564Sed 83312623Sphk if (!*name) 834139483Spjd return (ENOENT); 83512623Sphk 83612623Sphk p = name + strlen(name) - 1 ; 83712623Sphk if (*p == '.') 83812623Sphk *p = '\0'; 83912623Sphk 84012623Sphk *len = 0; 84112623Sphk 84212623Sphk for (p = name; *p && *p != '.'; p++) 84312623Sphk ; 84412623Sphk i = *p; 84512623Sphk if (i == '.') 84612623Sphk *p = '\0'; 84712623Sphk 84844078Sdfr oidp = SLIST_FIRST(lsp); 84912623Sphk 85044078Sdfr while (oidp && *len < CTL_MAXNAME) { 85144078Sdfr if (strcmp(name, oidp->oid_name)) { 85244078Sdfr oidp = SLIST_NEXT(oidp, oid_link); 85312623Sphk continue; 85412623Sphk } 85544078Sdfr *oid++ = oidp->oid_number; 85612623Sphk (*len)++; 85712623Sphk 85812623Sphk if (!i) { 85944078Sdfr if (oidpp) 86044078Sdfr *oidpp = oidp; 86112623Sphk return (0); 86212623Sphk } 86312623Sphk 86444078Sdfr if ((oidp->oid_kind & CTLTYPE) != CTLTYPE_NODE) 86512623Sphk break; 86612623Sphk 86744078Sdfr if (oidp->oid_handler) 86812623Sphk break; 86912623Sphk 870216058Smdf lsp = SYSCTL_CHILDREN(oidp); 87144078Sdfr oidp = SLIST_FIRST(lsp); 87212623Sphk name = p+1; 87312623Sphk for (p = name; *p && *p != '.'; p++) 87412623Sphk ; 87512623Sphk i = *p; 87612623Sphk if (i == '.') 87712623Sphk *p = '\0'; 87812623Sphk } 879139483Spjd return (ENOENT); 88012623Sphk} 88112623Sphk 88212623Sphkstatic int 88362573Sphksysctl_sysctl_name2oid(SYSCTL_HANDLER_ARGS) 88412623Sphk{ 88512623Sphk char *p; 886216066Smdf int error, oid[CTL_MAXNAME], len = 0; 88712623Sphk struct sysctl_oid *op = 0; 88812623Sphk 88912623Sphk if (!req->newlen) 890139483Spjd return (ENOENT); 89145140Sphk if (req->newlen >= MAXPATHLEN) /* XXX arbitrary, undocumented */ 89245140Sphk return (ENAMETOOLONG); 89312623Sphk 894111119Simp p = malloc(req->newlen+1, M_SYSCTL, M_WAITOK); 89512623Sphk 89612623Sphk error = SYSCTL_IN(req, p, req->newlen); 89712623Sphk if (error) { 89812623Sphk free(p, M_SYSCTL); 89912623Sphk return (error); 90012623Sphk } 90112623Sphk 90212623Sphk p [req->newlen] = '\0'; 90312623Sphk 904216060Smdf SYSCTL_XLOCK(); 90512623Sphk error = name2oid(p, oid, &len, &op); 906216060Smdf SYSCTL_XUNLOCK(); 90712623Sphk 90812623Sphk free(p, M_SYSCTL); 90912623Sphk 91012623Sphk if (error) 91112623Sphk return (error); 91212623Sphk 91312650Sphk error = SYSCTL_OUT(req, oid, len * sizeof *oid); 91412623Sphk return (error); 91512623Sphk} 91612623Sphk 917224159Srwatson/* 918224159Srwatson * XXXRW/JA: Shouldn't return name2oid data for nodes that we don't permit in 919224159Srwatson * capability mode. 920224159Srwatson */ 921217555SmdfSYSCTL_PROC(_sysctl, 3, name2oid, 922224159Srwatson CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_ANYBODY | CTLFLAG_MPSAFE 923224159Srwatson | CTLFLAG_CAPRW, 0, 0, sysctl_sysctl_name2oid, "I", ""); 92412623Sphk 92512623Sphkstatic int 92662573Sphksysctl_sysctl_oidfmt(SYSCTL_HANDLER_ARGS) 92712623Sphk{ 92844078Sdfr struct sysctl_oid *oid; 92953977Sgreen int error; 93012623Sphk 931216060Smdf SYSCTL_XLOCK(); 93253977Sgreen error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 93353977Sgreen if (error) 934216060Smdf goto out; 93512623Sphk 936216060Smdf if (oid->oid_fmt == NULL) { 937216060Smdf error = ENOENT; 938216060Smdf goto out; 939216060Smdf } 94053977Sgreen error = SYSCTL_OUT(req, &oid->oid_kind, sizeof(oid->oid_kind)); 94153977Sgreen if (error) 942216060Smdf goto out; 94353977Sgreen error = SYSCTL_OUT(req, oid->oid_fmt, strlen(oid->oid_fmt) + 1); 944216060Smdf out: 945216060Smdf SYSCTL_XUNLOCK(); 94612650Sphk return (error); 94712623Sphk} 94812623Sphk 94942467Sphk 950224159Srwatsonstatic SYSCTL_NODE(_sysctl, 4, oidfmt, CTLFLAG_RD|CTLFLAG_MPSAFE|CTLFLAG_CAPRD, 951187864Sed sysctl_sysctl_oidfmt, ""); 95212623Sphk 95388006Sluigistatic int 95488006Sluigisysctl_sysctl_oiddescr(SYSCTL_HANDLER_ARGS) 95588006Sluigi{ 95688006Sluigi struct sysctl_oid *oid; 95788006Sluigi int error; 95888006Sluigi 959216060Smdf SYSCTL_XLOCK(); 96088006Sluigi error = sysctl_find_oid(arg1, arg2, &oid, NULL, req); 96188006Sluigi if (error) 962216060Smdf goto out; 96388006Sluigi 964216060Smdf if (oid->oid_descr == NULL) { 965216060Smdf error = ENOENT; 966216060Smdf goto out; 967216060Smdf } 968141433Sphk error = SYSCTL_OUT(req, oid->oid_descr, strlen(oid->oid_descr) + 1); 969216060Smdf out: 970216060Smdf SYSCTL_XUNLOCK(); 97188006Sluigi return (error); 97288006Sluigi} 97388006Sluigi 974224159Srwatsonstatic SYSCTL_NODE(_sysctl, 5, oiddescr, CTLFLAG_RD|CTLFLAG_CAPRD, 975224159Srwatson sysctl_sysctl_oiddescr, ""); 97688006Sluigi 97712243Sphk/* 97812623Sphk * Default "handler" functions. 97912623Sphk */ 98012623Sphk 98112623Sphk/* 98242095Sdfr * Handle an int, signed or unsigned. 98312243Sphk * Two cases: 98412243Sphk * a variable: point arg1 at it. 98512243Sphk * a constant: pass it in arg2. 98612243Sphk */ 98712243Sphk 98811865Sphkint 98962573Sphksysctl_handle_int(SYSCTL_HANDLER_ARGS) 99011863Sphk{ 991100833Struckman int tmpout, error = 0; 99211863Sphk 993100833Struckman /* 994100833Struckman * Attempt to get a coherent snapshot by making a copy of the data. 995100833Struckman */ 99612243Sphk if (arg1) 997100833Struckman tmpout = *(int *)arg1; 99820506Sbde else 999100833Struckman tmpout = arg2; 1000100833Struckman error = SYSCTL_OUT(req, &tmpout, sizeof(int)); 100111863Sphk 100212243Sphk if (error || !req->newptr) 100312243Sphk return (error); 100411863Sphk 100512243Sphk if (!arg1) 100612243Sphk error = EPERM; 100712243Sphk else 100812243Sphk error = SYSCTL_IN(req, arg1, sizeof(int)); 100912243Sphk return (error); 101011863Sphk} 101111863Sphk 101212243Sphk/* 1013155758Sandre * Based on on sysctl_handle_int() convert milliseconds into ticks. 1014195699Srwatson * Note: this is used by TCP. 1015155758Sandre */ 1016155758Sandre 1017155758Sandreint 1018155758Sandresysctl_msec_to_ticks(SYSCTL_HANDLER_ARGS) 1019155758Sandre{ 1020155758Sandre int error, s, tt; 1021155758Sandre 1022191688Szec tt = *(int *)arg1; 1023155758Sandre s = (int)((int64_t)tt * 1000 / hz); 1024155758Sandre 1025155758Sandre error = sysctl_handle_int(oidp, &s, 0, req); 1026155758Sandre if (error || !req->newptr) 1027155758Sandre return (error); 1028155758Sandre 1029155758Sandre tt = (int)((int64_t)s * hz / 1000); 1030155758Sandre if (tt < 1) 1031155758Sandre return (EINVAL); 1032155758Sandre 1033191688Szec *(int *)arg1 = tt; 1034155758Sandre return (0); 1035155758Sandre} 1036155758Sandre 1037155758Sandre 1038155758Sandre/* 1039247656Smarius * Handle a long, signed or unsigned. 1040247656Smarius * Two cases: 1041247656Smarius * a variable: point arg1 at it. 1042247656Smarius * a constant: pass it in arg2. 104338517Sdfr */ 104438517Sdfr 104538517Sdfrint 104662573Sphksysctl_handle_long(SYSCTL_HANDLER_ARGS) 104738517Sdfr{ 104838517Sdfr int error = 0; 1049136404Speter long tmplong; 1050136404Speter#ifdef SCTL_MASK32 1051136404Speter int tmpint; 1052136404Speter#endif 105338517Sdfr 1054100833Struckman /* 1055100833Struckman * Attempt to get a coherent snapshot by making a copy of the data. 1056100833Struckman */ 1057247656Smarius if (arg1) 1058247656Smarius tmplong = *(long *)arg1; 1059247656Smarius else 1060247656Smarius tmplong = arg2; 1061136404Speter#ifdef SCTL_MASK32 1062136404Speter if (req->flags & SCTL_MASK32) { 1063136404Speter tmpint = tmplong; 1064136404Speter error = SYSCTL_OUT(req, &tmpint, sizeof(int)); 1065136404Speter } else 1066136404Speter#endif 1067136404Speter error = SYSCTL_OUT(req, &tmplong, sizeof(long)); 106838517Sdfr 106938517Sdfr if (error || !req->newptr) 107038517Sdfr return (error); 107138517Sdfr 1072247656Smarius if (!arg1) 1073247656Smarius error = EPERM; 1074136404Speter#ifdef SCTL_MASK32 1075247656Smarius else if (req->flags & SCTL_MASK32) { 1076136404Speter error = SYSCTL_IN(req, &tmpint, sizeof(int)); 1077136404Speter *(long *)arg1 = (long)tmpint; 1078247656Smarius } 1079136404Speter#endif 1080247656Smarius else 1081136404Speter error = SYSCTL_IN(req, arg1, sizeof(long)); 108238517Sdfr return (error); 108338517Sdfr} 108438517Sdfr 108538517Sdfr/* 1086247656Smarius * Handle a 64 bit int, signed or unsigned. 1087247656Smarius * Two cases: 1088247656Smarius * a variable: point arg1 at it. 1089247656Smarius * a constant: pass it in arg2. 1090170288Sdwmalone */ 1091170288Sdwmaloneint 1092217616Smdfsysctl_handle_64(SYSCTL_HANDLER_ARGS) 1093170288Sdwmalone{ 1094170288Sdwmalone int error = 0; 1095170288Sdwmalone uint64_t tmpout; 1096170288Sdwmalone 1097170288Sdwmalone /* 1098170288Sdwmalone * Attempt to get a coherent snapshot by making a copy of the data. 1099170288Sdwmalone */ 1100247656Smarius if (arg1) 1101247656Smarius tmpout = *(uint64_t *)arg1; 1102247656Smarius else 1103247656Smarius tmpout = arg2; 1104170288Sdwmalone error = SYSCTL_OUT(req, &tmpout, sizeof(uint64_t)); 1105170288Sdwmalone 1106170288Sdwmalone if (error || !req->newptr) 1107170288Sdwmalone return (error); 1108170288Sdwmalone 1109247656Smarius if (!arg1) 1110247656Smarius error = EPERM; 1111247656Smarius else 1112247656Smarius error = SYSCTL_IN(req, arg1, sizeof(uint64_t)); 1113170288Sdwmalone return (error); 1114170288Sdwmalone} 1115170288Sdwmalone 1116170288Sdwmalone/* 111712243Sphk * Handle our generic '\0' terminated 'C' string. 111812243Sphk * Two cases: 111912243Sphk * a variable string: point arg1 at it, arg2 is max length. 112012243Sphk * a constant string: point arg1 at it, arg2 is zero. 112112243Sphk */ 112212243Sphk 112311865Sphkint 112462573Sphksysctl_handle_string(SYSCTL_HANDLER_ARGS) 112511863Sphk{ 112612243Sphk int error=0; 1127100833Struckman char *tmparg; 1128100833Struckman size_t outlen; 112911863Sphk 1130100833Struckman /* 1131100833Struckman * Attempt to get a coherent snapshot by copying to a 1132100833Struckman * temporary kernel buffer. 1133100833Struckman */ 1134100833Struckmanretry: 1135100833Struckman outlen = strlen((char *)arg1)+1; 1136111119Simp tmparg = malloc(outlen, M_SYSCTLTMP, M_WAITOK); 1137105354Srobert 1138105354Srobert if (strlcpy(tmparg, (char *)arg1, outlen) >= outlen) { 1139100833Struckman free(tmparg, M_SYSCTLTMP); 1140100833Struckman goto retry; 1141100833Struckman } 1142105354Srobert 1143100833Struckman error = SYSCTL_OUT(req, tmparg, outlen); 1144100833Struckman free(tmparg, M_SYSCTLTMP); 114511863Sphk 114645140Sphk if (error || !req->newptr) 114712243Sphk return (error); 114811863Sphk 114945140Sphk if ((req->newlen - req->newidx) >= arg2) { 115045140Sphk error = EINVAL; 115112243Sphk } else { 115212243Sphk arg2 = (req->newlen - req->newidx); 115312243Sphk error = SYSCTL_IN(req, arg1, arg2); 115412243Sphk ((char *)arg1)[arg2] = '\0'; 115511863Sphk } 115612131Sphk 115712131Sphk return (error); 115811863Sphk} 115911863Sphk 116012243Sphk/* 116112243Sphk * Handle any kind of opaque data. 116212243Sphk * arg1 points to it, arg2 is the size. 116312243Sphk */ 116412243Sphk 116511865Sphkint 116662573Sphksysctl_handle_opaque(SYSCTL_HANDLER_ARGS) 116711863Sphk{ 1168120803Sbms int error, tries; 1169120803Sbms u_int generation; 1170120813Sbms struct sysctl_req req2; 117112243Sphk 1172100833Struckman /* 1173120803Sbms * Attempt to get a coherent snapshot, by using the thread 1174120803Sbms * pre-emption counter updated from within mi_switch() to 1175120803Sbms * determine if we were pre-empted during a bcopy() or 1176120803Sbms * copyout(). Make 3 attempts at doing this before giving up. 1177120803Sbms * If we encounter an error, stop immediately. 1178100833Struckman */ 1179120803Sbms tries = 0; 1180120813Sbms req2 = *req; 1181120813Sbmsretry: 1182120813Sbms generation = curthread->td_generation; 1183120813Sbms error = SYSCTL_OUT(req, arg1, arg2); 1184120813Sbms if (error) 1185120813Sbms return (error); 1186120813Sbms tries++; 1187120813Sbms if (generation != curthread->td_generation && tries < 3) { 1188120813Sbms *req = req2; 1189120813Sbms goto retry; 1190120813Sbms } 119112243Sphk 119212243Sphk error = SYSCTL_IN(req, arg1, arg2); 119312243Sphk 119412243Sphk return (error); 119512243Sphk} 119612243Sphk 119712260Sphk/* 119812260Sphk * Transfer functions to/from kernel space. 119912260Sphk * XXX: rather untested at this point 120012260Sphk */ 120112260Sphkstatic int 120238517Sdfrsysctl_old_kernel(struct sysctl_req *req, const void *p, size_t l) 120312243Sphk{ 120438517Sdfr size_t i = 0; 120512260Sphk 120612260Sphk if (req->oldptr) { 120738517Sdfr i = l; 120873971Stmm if (req->oldlen <= req->oldidx) 120973971Stmm i = 0; 121073971Stmm else 121173971Stmm if (i > req->oldlen - req->oldidx) 121273971Stmm i = req->oldlen - req->oldidx; 121312260Sphk if (i > 0) 121417971Sbde bcopy(p, (char *)req->oldptr + req->oldidx, i); 121512243Sphk } 1216192144Skib req->oldidx += l; 121716282Snate if (req->oldptr && i != l) 121811863Sphk return (ENOMEM); 121912260Sphk return (0); 122012243Sphk} 122112243Sphk 122212260Sphkstatic int 122338517Sdfrsysctl_new_kernel(struct sysctl_req *req, void *p, size_t l) 122412243Sphk{ 122512260Sphk if (!req->newptr) 1226139483Spjd return (0); 122712260Sphk if (req->newlen - req->newidx < l) 122811863Sphk return (EINVAL); 122917971Sbde bcopy((char *)req->newptr + req->newidx, p, l); 123012243Sphk req->newidx += l; 123112131Sphk return (0); 123211863Sphk} 123311863Sphk 123416282Snateint 123583366Sjuliankernel_sysctl(struct thread *td, int *name, u_int namelen, void *old, 1236136404Speter size_t *oldlenp, void *new, size_t newlen, size_t *retval, int flags) 123716282Snate{ 123816282Snate int error = 0; 123916282Snate struct sysctl_req req; 124016282Snate 124116282Snate bzero(&req, sizeof req); 124216282Snate 124386183Srwatson req.td = td; 1244136404Speter req.flags = flags; 124516282Snate 124616282Snate if (oldlenp) { 124716282Snate req.oldlen = *oldlenp; 124816282Snate } 1249127052Struckman req.validlen = req.oldlen; 125016282Snate 125116282Snate if (old) { 125216282Snate req.oldptr= old; 125316282Snate } 125416282Snate 125577646Sdd if (new != NULL) { 125616282Snate req.newlen = newlen; 125716282Snate req.newptr = new; 125816282Snate } 125916282Snate 126016282Snate req.oldfunc = sysctl_old_kernel; 126116282Snate req.newfunc = sysctl_new_kernel; 1262217915Smdf req.lock = REQ_UNWIRED; 126316282Snate 1264216060Smdf SYSCTL_XLOCK(); 126516282Snate error = sysctl_root(0, name, namelen, &req); 1266216060Smdf SYSCTL_XUNLOCK(); 1267120813Sbms 1268127052Struckman if (req.lock == REQ_WIRED && req.validlen > 0) 1269127052Struckman vsunlock(req.oldptr, req.validlen); 127016282Snate 127116282Snate if (error && error != ENOMEM) 127216282Snate return (error); 127316282Snate 127416282Snate if (retval) { 1275127052Struckman if (req.oldptr && req.oldidx > req.validlen) 1276127052Struckman *retval = req.validlen; 127716282Snate else 127816282Snate *retval = req.oldidx; 127916282Snate } 128016282Snate return (error); 128116282Snate} 128216282Snate 128376834Sjlemonint 128483366Sjuliankernel_sysctlbyname(struct thread *td, char *name, void *old, size_t *oldlenp, 1285136404Speter void *new, size_t newlen, size_t *retval, int flags) 128676834Sjlemon{ 128776834Sjlemon int oid[CTL_MAXNAME]; 128878620Smjacob size_t oidlen, plen; 128978620Smjacob int error; 129076834Sjlemon 129176834Sjlemon oid[0] = 0; /* sysctl internal magic */ 129276834Sjlemon oid[1] = 3; /* name2oid */ 129376834Sjlemon oidlen = sizeof(oid); 129476834Sjlemon 129583366Sjulian error = kernel_sysctl(td, oid, 2, oid, &oidlen, 1296136404Speter (void *)name, strlen(name), &plen, flags); 129776834Sjlemon if (error) 129876834Sjlemon return (error); 129976834Sjlemon 130083366Sjulian error = kernel_sysctl(td, oid, plen / sizeof(int), old, oldlenp, 1301136404Speter new, newlen, retval, flags); 130276834Sjlemon return (error); 130376834Sjlemon} 130476834Sjlemon 130512260Sphk/* 130612260Sphk * Transfer function to/from user space. 130712260Sphk */ 130812260Sphkstatic int 130938517Sdfrsysctl_old_user(struct sysctl_req *req, const void *p, size_t l) 131012243Sphk{ 1311126253Struckman size_t i, len, origidx; 1312233647Salc int error; 131312243Sphk 1314126253Struckman origidx = req->oldidx; 1315192144Skib req->oldidx += l; 1316192144Skib if (req->oldptr == NULL) 1317126253Struckman return (0); 1318148864Scsjp /* 1319148864Scsjp * If we have not wired the user supplied buffer and we are currently 1320148864Scsjp * holding locks, drop a witness warning, as it's possible that 1321148864Scsjp * write operations to the user page can sleep. 1322148864Scsjp */ 1323148864Scsjp if (req->lock != REQ_WIRED) 1324111883Sjhb WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1325111883Sjhb "sysctl_old_user()"); 1326126253Struckman i = l; 1327127052Struckman len = req->validlen; 1328126253Struckman if (len <= origidx) 1329126253Struckman i = 0; 1330126253Struckman else { 1331126253Struckman if (i > len - origidx) 1332126253Struckman i = len - origidx; 1333233647Salc if (req->lock == REQ_WIRED) { 1334233647Salc error = copyout_nofault(p, (char *)req->oldptr + 1335233647Salc origidx, i); 1336233647Salc } else 1337233647Salc error = copyout(p, (char *)req->oldptr + origidx, i); 1338233647Salc if (error != 0) 1339233647Salc return (error); 134012260Sphk } 1341126253Struckman if (i < l) 134212243Sphk return (ENOMEM); 134312260Sphk return (0); 134412243Sphk} 134512243Sphk 134612260Sphkstatic int 134738517Sdfrsysctl_new_user(struct sysctl_req *req, void *p, size_t l) 134812243Sphk{ 134912285Sphk int error; 135012260Sphk 135112260Sphk if (!req->newptr) 1352139483Spjd return (0); 135312260Sphk if (req->newlen - req->newidx < l) 135412243Sphk return (EINVAL); 1355148873Scsjp WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1356148873Scsjp "sysctl_new_user()"); 135717971Sbde error = copyin((char *)req->newptr + req->newidx, p, l); 135812243Sphk req->newidx += l; 135912243Sphk return (error); 136012243Sphk} 136112243Sphk 1362100487Struckman/* 1363100487Struckman * Wire the user space destination buffer. If set to a value greater than 1364100487Struckman * zero, the len parameter limits the maximum amount of wired memory. 1365100487Struckman */ 1366126253Struckmanint 1367100487Struckmansysctl_wire_old_buffer(struct sysctl_req *req, size_t len) 1368100487Struckman{ 1369126253Struckman int ret; 1370192160Sdes size_t wiredlen; 1371126253Struckman 1372126253Struckman wiredlen = (len > 0 && len < req->oldlen) ? len : req->oldlen; 1373126253Struckman ret = 0; 1374217915Smdf if (req->lock != REQ_WIRED && req->oldptr && 1375120781Sbms req->oldfunc == sysctl_old_user) { 1376127050Struckman if (wiredlen != 0) { 1377127050Struckman ret = vslock(req->oldptr, wiredlen); 1378130327Sgreen if (ret != 0) { 1379130327Sgreen if (ret != ENOMEM) 1380130327Sgreen return (ret); 1381130327Sgreen wiredlen = 0; 1382130327Sgreen } 1383126253Struckman } 1384127050Struckman req->lock = REQ_WIRED; 1385127052Struckman req->validlen = wiredlen; 1386100487Struckman } 1387127050Struckman return (0); 1388100487Struckman} 1389100487Struckman 13901541Srgrimesint 139153977Sgreensysctl_find_oid(int *name, u_int namelen, struct sysctl_oid **noid, 139253977Sgreen int *nindx, struct sysctl_req *req) 139312131Sphk{ 1394216059Smdf struct sysctl_oid_list *lsp; 139544078Sdfr struct sysctl_oid *oid; 139653977Sgreen int indx; 139712131Sphk 1398216060Smdf SYSCTL_ASSERT_XLOCKED(); 1399216059Smdf lsp = &sysctl__children; 140012131Sphk indx = 0; 1401216059Smdf while (indx < CTL_MAXNAME) { 1402216059Smdf SLIST_FOREACH(oid, lsp, oid_link) { 1403216059Smdf if (oid->oid_number == name[indx]) 1404216059Smdf break; 1405216059Smdf } 1406216059Smdf if (oid == NULL) 1407216059Smdf return (ENOENT); 1408216059Smdf 1409216059Smdf indx++; 1410216059Smdf if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1411216059Smdf if (oid->oid_handler != NULL || indx == namelen) { 141253977Sgreen *noid = oid; 141353977Sgreen if (nindx != NULL) 141453977Sgreen *nindx = indx; 1415216060Smdf KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0, 1416216060Smdf ("%s found DYING node %p", __func__, oid)); 141753977Sgreen return (0); 141812131Sphk } 1419216059Smdf lsp = SYSCTL_CHILDREN(oid); 1420216059Smdf } else if (indx == namelen) { 1421216059Smdf *noid = oid; 1422216059Smdf if (nindx != NULL) 1423216059Smdf *nindx = indx; 1424216060Smdf KASSERT((oid->oid_kind & CTLFLAG_DYING) == 0, 1425216060Smdf ("%s found DYING node %p", __func__, oid)); 1426216059Smdf return (0); 142712131Sphk } else { 1428216059Smdf return (ENOTDIR); 142912131Sphk } 143012131Sphk } 143153977Sgreen return (ENOENT); 143253977Sgreen} 143353977Sgreen 143453977Sgreen/* 143553977Sgreen * Traverse our tree, and find the right node, execute whatever it points 143653977Sgreen * to, and return the resulting error code. 143753977Sgreen */ 143853977Sgreen 1439104094Sphkstatic int 144062573Sphksysctl_root(SYSCTL_HANDLER_ARGS) 144153977Sgreen{ 144253977Sgreen struct sysctl_oid *oid; 1443109246Sdillon int error, indx, lvl; 144453977Sgreen 1445216060Smdf SYSCTL_ASSERT_XLOCKED(); 1446186564Sed 144753977Sgreen error = sysctl_find_oid(arg1, arg2, &oid, &indx, req); 144853977Sgreen if (error) 144953977Sgreen return (error); 145053977Sgreen 145153977Sgreen if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 145253977Sgreen /* 145353977Sgreen * You can't call a sysctl when it's a node, but has 145453977Sgreen * no handler. Inform the user that it's a node. 145553977Sgreen * The indx may or may not be the same as namelen. 145653977Sgreen */ 145753977Sgreen if (oid->oid_handler == NULL) 145853977Sgreen return (EISDIR); 145953977Sgreen } 146053977Sgreen 146183968Srwatson /* Is this sysctl writable? */ 146283968Srwatson if (req->newptr && !(oid->oid_kind & CTLFLAG_WR)) 146312131Sphk return (EPERM); 146412131Sphk 146592953Srwatson KASSERT(req->td != NULL, ("sysctl_root(): req->td == NULL")); 146692953Srwatson 1467224159Srwatson#ifdef CAPABILITY_MODE 1468224159Srwatson /* 1469224159Srwatson * If the process is in capability mode, then don't permit reading or 1470224159Srwatson * writing unless specifically granted for the node. 1471224159Srwatson */ 1472224159Srwatson if (IN_CAPABILITY_MODE(req->td)) { 1473224159Srwatson if (req->oldptr && !(oid->oid_kind & CTLFLAG_CAPRD)) 1474224159Srwatson return (EPERM); 1475224159Srwatson if (req->newptr && !(oid->oid_kind & CTLFLAG_CAPWR)) 1476224159Srwatson return (EPERM); 1477224159Srwatson } 1478224159Srwatson#endif 1479224159Srwatson 148083968Srwatson /* Is this sysctl sensitive to securelevels? */ 148183968Srwatson if (req->newptr && (oid->oid_kind & CTLFLAG_SECURE)) { 1482109246Sdillon lvl = (oid->oid_kind & CTLMASK_SECURE) >> CTLSHIFT_SECURE; 1483109246Sdillon error = securelevel_gt(req->td->td_ucred, lvl); 148492953Srwatson if (error) 148592953Srwatson return (error); 148683968Srwatson } 148712910Sphk 148883968Srwatson /* Is this sysctl writable by only privileged users? */ 148983968Srwatson if (req->newptr && !(oid->oid_kind & CTLFLAG_ANYBODY)) { 1490196176Sbz int priv; 1491196176Sbz 149292953Srwatson if (oid->oid_kind & CTLFLAG_PRISON) 1493196176Sbz priv = PRIV_SYSCTL_WRITEJAIL; 1494196176Sbz#ifdef VIMAGE 1495196176Sbz else if ((oid->oid_kind & CTLFLAG_VNET) && 1496196176Sbz prison_owns_vnet(req->td->td_ucred)) 1497196176Sbz priv = PRIV_SYSCTL_WRITEJAIL; 1498196176Sbz#endif 149992953Srwatson else 1500196176Sbz priv = PRIV_SYSCTL_WRITE; 1501196176Sbz error = priv_check(req->td, priv); 150292953Srwatson if (error) 150392953Srwatson return (error); 150483968Srwatson } 150583968Srwatson 150644078Sdfr if (!oid->oid_handler) 1507139483Spjd return (EINVAL); 150812131Sphk 1509126121Spjd if ((oid->oid_kind & CTLTYPE) == CTLTYPE_NODE) { 1510132776Skan arg1 = (int *)arg1 + indx; 1511126121Spjd arg2 -= indx; 1512126121Spjd } else { 1513126121Spjd arg1 = oid->oid_arg1; 1514126121Spjd arg2 = oid->oid_arg2; 1515126121Spjd } 1516126121Spjd#ifdef MAC 1517172930Srwatson error = mac_system_check_sysctl(req->td->td_ucred, oid, arg1, arg2, 1518126121Spjd req); 1519126121Spjd if (error != 0) 1520126121Spjd return (error); 1521126121Spjd#endif 1522216060Smdf oid->oid_running++; 1523216060Smdf SYSCTL_XUNLOCK(); 1524216060Smdf 1525187656Sjhb if (!(oid->oid_kind & CTLFLAG_MPSAFE)) 1526187656Sjhb mtx_lock(&Giant); 1527126121Spjd error = oid->oid_handler(oid, arg1, arg2, req); 1528187656Sjhb if (!(oid->oid_kind & CTLFLAG_MPSAFE)) 1529187656Sjhb mtx_unlock(&Giant); 1530126121Spjd 1531216060Smdf KFAIL_POINT_ERROR(_debug_fail_point, sysctl_running, error); 1532216060Smdf 1533216060Smdf SYSCTL_XLOCK(); 1534216060Smdf oid->oid_running--; 1535216060Smdf if (oid->oid_running == 0 && (oid->oid_kind & CTLFLAG_DYING) != 0) 1536216060Smdf wakeup(&oid->oid_running); 153753977Sgreen return (error); 153812131Sphk} 153912131Sphk 154012221Sbde#ifndef _SYS_SYSPROTO_H_ 154112171Sphkstruct sysctl_args { 154212171Sphk int *name; 154312171Sphk u_int namelen; 154412171Sphk void *old; 154512171Sphk size_t *oldlenp; 154612171Sphk void *new; 154712171Sphk size_t newlen; 154812171Sphk}; 154912221Sbde#endif 155012131Sphkint 1551225617Skmacysys___sysctl(struct thread *td, struct sysctl_args *uap) 15521541Srgrimes{ 1553188232Sjhb int error, i, name[CTL_MAXNAME]; 155438517Sdfr size_t j; 15551541Srgrimes 15561541Srgrimes if (uap->namelen > CTL_MAXNAME || uap->namelen < 2) 15571541Srgrimes return (EINVAL); 155811863Sphk 15593308Sphk error = copyin(uap->name, &name, uap->namelen * sizeof(int)); 15603308Sphk if (error) 15611541Srgrimes return (error); 15621541Srgrimes 156383366Sjulian error = userland_sysctl(td, name, uap->namelen, 156412171Sphk uap->old, uap->oldlenp, 0, 1565136404Speter uap->new, uap->newlen, &j, 0); 156612260Sphk if (error && error != ENOMEM) 1567186564Sed return (error); 1568186664Sed if (uap->oldlenp) { 1569188232Sjhb i = copyout(&j, uap->oldlenp, sizeof(j)); 1570186664Sed if (i) 1571186664Sed return (i); 1572186664Sed } 157312260Sphk return (error); 157412171Sphk} 157512171Sphk 157612171Sphk/* 157712171Sphk * This is used from various compatibility syscalls too. That's why name 157812171Sphk * must be in kernel space. 157912171Sphk */ 158012171Sphkint 158183366Sjulianuserland_sysctl(struct thread *td, int *name, u_int namelen, void *old, 1582136404Speter size_t *oldlenp, int inkernel, void *new, size_t newlen, size_t *retval, 1583136404Speter int flags) 158412171Sphk{ 1585192125Sjhb int error = 0, memlocked; 1586127052Struckman struct sysctl_req req; 158712171Sphk 158812243Sphk bzero(&req, sizeof req); 158912243Sphk 159086183Srwatson req.td = td; 1591136404Speter req.flags = flags; 159212285Sphk 159312171Sphk if (oldlenp) { 159412171Sphk if (inkernel) { 159512243Sphk req.oldlen = *oldlenp; 159612171Sphk } else { 159712260Sphk error = copyin(oldlenp, &req.oldlen, sizeof(*oldlenp)); 159812171Sphk if (error) 159912171Sphk return (error); 160012171Sphk } 160112171Sphk } 1602127052Struckman req.validlen = req.oldlen; 160312171Sphk 160412243Sphk if (old) { 160552644Sphk if (!useracc(old, req.oldlen, VM_PROT_WRITE)) 160612243Sphk return (EFAULT); 160712243Sphk req.oldptr= old; 160812243Sphk } 160912131Sphk 161077646Sdd if (new != NULL) { 1611172038Srwatson if (!useracc(new, newlen, VM_PROT_READ)) 161212243Sphk return (EFAULT); 161312243Sphk req.newlen = newlen; 161412243Sphk req.newptr = new; 161511863Sphk } 161612131Sphk 161712243Sphk req.oldfunc = sysctl_old_user; 161812243Sphk req.newfunc = sysctl_new_user; 1619217915Smdf req.lock = REQ_UNWIRED; 162011863Sphk 1621189707Sjhb#ifdef KTRACE 1622189707Sjhb if (KTRPOINT(curthread, KTR_SYSCTL)) 1623189707Sjhb ktrsysctl(name, namelen); 1624189707Sjhb#endif 1625192125Sjhb 1626192125Sjhb if (req.oldlen > PAGE_SIZE) { 1627192125Sjhb memlocked = 1; 1628192125Sjhb sx_xlock(&sysctlmemlock); 1629192125Sjhb } else 1630192125Sjhb memlocked = 0; 1631194252Sjamie CURVNET_SET(TD_TO_VNET(td)); 163212429Sphk 1633185983Skib for (;;) { 1634127052Struckman req.oldidx = 0; 1635127052Struckman req.newidx = 0; 1636216060Smdf SYSCTL_XLOCK(); 1637127052Struckman error = sysctl_root(0, name, namelen, &req); 1638216060Smdf SYSCTL_XUNLOCK(); 1639185983Skib if (error != EAGAIN) 1640185983Skib break; 1641221829Smdf kern_yield(PRI_USER); 1642185983Skib } 164312243Sphk 1644186564Sed CURVNET_RESTORE(); 1645186564Sed 1646127052Struckman if (req.lock == REQ_WIRED && req.validlen > 0) 1647127052Struckman vsunlock(req.oldptr, req.validlen); 1648192125Sjhb if (memlocked) 1649192125Sjhb sx_xunlock(&sysctlmemlock); 165012429Sphk 165112260Sphk if (error && error != ENOMEM) 165212260Sphk return (error); 165312260Sphk 165412260Sphk if (retval) { 1655127052Struckman if (req.oldptr && req.oldidx > req.validlen) 1656127052Struckman *retval = req.validlen; 165712260Sphk else 165812260Sphk *retval = req.oldidx; 165911863Sphk } 166012260Sphk return (error); 16611541Srgrimes} 1662212750Smdf 1663212750Smdf/* 1664217916Smdf * Drain into a sysctl struct. The user buffer should be wired if a page 1665217916Smdf * fault would cause issue. 1666212750Smdf */ 1667212750Smdfstatic int 1668212750Smdfsbuf_sysctl_drain(void *arg, const char *data, int len) 1669212750Smdf{ 1670212750Smdf struct sysctl_req *req = arg; 1671212750Smdf int error; 1672212750Smdf 1673212750Smdf error = SYSCTL_OUT(req, data, len); 1674212750Smdf KASSERT(error >= 0, ("Got unexpected negative value %d", error)); 1675212750Smdf return (error == 0 ? len : -error); 1676212750Smdf} 1677212750Smdf 1678212750Smdfstruct sbuf * 1679212750Smdfsbuf_new_for_sysctl(struct sbuf *s, char *buf, int length, 1680212750Smdf struct sysctl_req *req) 1681212750Smdf{ 1682212750Smdf 1683212750Smdf s = sbuf_new(s, buf, length, SBUF_FIXEDLEN); 1684212750Smdf sbuf_set_drain(s, sbuf_sysctl_drain, req); 1685212750Smdf return (s); 1686212750Smdf} 1687